Carbureter for internal-combustion engines.



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OARBURBTER FOR INTERNAL GOMBUSTION ENGINES.

APPLICATION FILED Nov.11, 1911.

1,080,81 5, Patented Deo. 9, 1913.

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ERNEST PERCIVAL 'EVEBEST, 0F GIOVENTRY, ENGLAND. HW"

CARBURETER FOR INTERNAL-COMBUSTION ENGINES.'

To all whom t may concern:

lie it known that l, ERNEST Pmzcimi. Evninis'i. a subjectbf the King .ot Great Britain, residing at Coventry, in the count)y of 'arwiclt, England, have invented certain new and useful improvements in Car- 'burctcrs for InternalCombustion Engines,

of which the following is a specification.

. This invention relatesl to spray carbureters l0 tor use on internal combustion engines and has for-its object toV provide an improved form ot' earbiu'eter oi the single lever type. y Carbureters of this type embody a variable air inlet, an adjustable earbureted air out-` let, and a variable jet device, all controlled by a single lever so that the passages-are, as 'a rule, increased or decreased simultaneously.'

In actual practice, to e'ope with dilierent conditionsI the constitution of the mixture i has to vary in orderthat good results may be obtained. Thus for slow ruiming a slightly richer mixture is necessary than -atother times, and with diiierent engines the richness varies differently throughout the range of movement of the contiol lever. .Thiscalls for a sensitive means of adjustment` of the size of the fuel outlet in relation to the air and gas passages, and it is to'provide vsuch improved inea-ns ot' adjustment that' is the object ot this invention.

- In` the accompanying drawings, Figure l is a central vertical section through part .of a carbureter constructed in accordance with this invention. The iioat chamber is omitted in this view .for simplici y as it forms no part of the invention. Fi 2 is similar View at right angles to Fig. 1, and showing the' float chamber. Fig. 3 is a pla 40 view of partof'the jet tube showing the je tion, Fig. 7 is a similar view showing the parts in the position in which air alone is admitted to the engine, and Fig. 8 is a plan view showing on an enlarged sc ale part of a jet tube with outlet holes of different sizes.

'Like letters indicate like parts throughout the drawings.

In thev construction illustrated, the'fuel s pecication of Letters Patent.

jet. consists of the tube A` proiecting into the carbureting chamber B. This tube is normally fed with petrol maintained at a Patented Dee. 9, 31913. Application filed November 11, 1911. Serial No. 659,769.

constant level by a float C or the like. In

the upper side of the tube A the fuel outlet holes l) are formed, it being understood that these are relatively small and that they are only mede in part of the length of the tube. lpon the outside of the tube a slide is arranged, this preferably taking the form of a sleeve held down by any suitable spring E, the sleeve being, if desired, constructed of lsome suitable anti-friction bearing metal, .such as white metal. In the construction illustrated the sleeve is made in two parts F and G adjustable in relation to one another. For instance, the sleeve part Ginny screw into the outer part F. It will be understood that as the complete sleeve is moved lalong the tube A the holes D are covered or uncovered so that any desired jet outlet-maybe obtained.

- The earbu'i'eting chamber is provided withl inlet and outlet ports H and J' and over these slides a piston K which tits snugly within the carbureting chamber and takes a bearing-'on the plain part A2 lof the jet tube.. for which purpose it is provided with a tubular eXte-nsionK2 which forms a bearing part. lt is also connected .to the slide so that` the two move together. The hearing part K2 of the piston may be guided in vpart of the carburcting chamber and terminates in any suitable device enabling the piston to'benioved. For example, as shown, it may be provided with an eye to which may be attached a rod or wire. It will be gathered that as the piston is movedv the jet slide is moved, and preferably these are arranged so that the ports H and J. and the jet. outlets D are opened and closed together.

It will be seen that by a variable .jet of this type any desired results may be obtained as the increase or decrease in the edective jet Voutlet need not be proportional to the movement of the slide and can easily be varied. Thus the jet outlets may be larger or more numerous at one point than at another, see Figs. 3 and 8, so that at eert-ain positions of the throttle richer or weaker mixtures may be obtained. Again,

adjusting the slide vparts F and G a simple temporary adjustment may be ob,- tained. 4

Conveniently the tube A isbored eccentrically, see Fig. 4.-, so that the wall is of small thickness at the top and the outlet passages formed by the holes D consequently short. The petrol level is arranged at or about -the top of the outlet passages and it is not necessary that the level be maintained by a float as the slide may be adapted to completely cut olii the outlets so as to constitute a valve. The spring E maintains a liquid-tight joint between the slide and the jet tube and a gas-tight one between the throtvtle face of the outlet. The spring forces the jet slide downward on to the jet tube and the throttle piston upward 'so as to maintain a gas-tight joint on the upper or outlet side of the throttle at all times if required.

If desired, the outlets may be formed of angular cuts see Fig. 5, so that a continuous or nearly continuous increase in the jet outlet can be obtained as the slide is moved longitudinally.

The angle of the slits may vary as shown roughly in Fig. 5 so that the area exposed may bear a suitable ratio to the correspond ing port opening yuncovered by the pist0n. If the port opening is a constant one, as may be obtained by making the openings rectangular, for the angular slits L a single longitudinal slit may be substituted. If desired the jet tube A may be made relatively large in diameter, and through the center of it longitudinally .may be arranged a tube see Z, Fig. 6, for the r the rod or the like by which the piston is Wholly. expose vthe medium. This tube unions Y or similar so as not to interpassage of some heating would be provided with connections 'at each end fere with the accessibility of the carbureter. It will be understood that the heating surface provided will be very large in relation to the jet tube which is of considerable ad vantage where fuels of heavy specific gravity are used. When such a heating tube is used moved may be arranged to one side.

In the particular construction of carbuvreter described it is obvious that the piston and jet slide may be operated by separa e levers.

Preferably the carbureter is so constructed that the piston throttlemay be moved beyond its closed position so as to partially or ports-but not to expose the jet outlets.

In l the piston is moved to the left to clse the ports, but further movement bevfynd the positionA in which all the jet outlets are-closed may be imparted to the piston to open up the ports on the right hand side and allow the passage of air alone, which is of-greatutilit lf'tially as set forth.

it will be seen thatv by4 this invention a very simple form of variable jet is provided in which very diflerent'results can be easily obtained lWithout changing the parts, although the jet tubes may be made easily removable and interchangeable.

l/Vhat I claim as my invention, and desire to secure by Letters Patent, is

1. In a spray carbureter, the combination of a spray chamber, a fuel supply tube projecting into said spray chamber, fuel outlets in the upper surface of said tube, a slide mounted on said upper surface and adapted to cover and uncover said fuel outlets, and a spring holding said tube and maintaining between said slide and the upper surface of said tube substantially as set forth.

2. In a spray carbureter, the combination of a spraying chamber, a throttle valve movable in said chamber, a fixed fuel tube projecting into said chamber, fuel outlets in a liquid tight joint the upper surface of said tube, a slide inounted exteriorly on said tube and adapted4 to cover and uncover said fuel outlets, a sprin arranged between the slide and the throttle valve and exerting downward pressure on the slide to maintain a close joint between the latter and the fuel tube, and an adjustable connection between said slide andv said throttle valve.

3. In a spray carbureter, the combination of a spraying chamber, spraying chamber, a gas outlet from said spraying chamber, a throttle valve adapted to cover and uncover said inlet and outlet, a fuel tube projecting into said chamber, fuel outlets in the upper surface of said tube, a slide mounted on said tube, and Aadapted to cover and uncover said fuel outlets, an adjustable connection between said slide and said .throttle valve, and. aspring-between said slide and the throttlee'valvd substan- In a spray tarbureter, thel combination 'of a spraying chamber, an air inlet to said spraying chamber, agas outle from said an air inlet to said spraying chamber, a throttle vali e adapted to cover and uncover saidinlet and said outlet, a fuel tube projecting into said chamber, fuel outletsn the upper surface of said tube, an

inner sleeve mounted on said tube, an outer sleeve having an' adjustable connection with said inner sleeve, a co/nnectionbetween the said outer sleeve and the throttle valve, and

a'spring between'said outer sleeve and the throttle valve, substantially as set forth.

Ina spray carbureter, thefcombinationv of a spraying chamber, an air inlet tosaid spraying chamber, a gas outlet from said spraying chamber, a throttleV valve adapted uncover-said inlet projecting intesa-id cham-benen eccentric passage in; saidfuel'ftube, fuel outlets .therefrom, an inner sleeve' ad p/tedto slide on to slide across saidspraying chamber and and outlet, .a fuel tube said tube, an outer sleeve having a. Screwe i naine to `lthis specification in the presenceo connection with said inner sleeve, conneetwo subscribing Witnesses. tion between said outer sleeve and tne throt- T T Q vp n T q 1 tie Valve, and a spring between said outer LRBET PARDTVAL ETVEREU' sleeve and the throttle valve, substantiaily as "Witnesses: set forth. ERICH WALFORD,

In testimony whereof I have signed mv JOHN T. FAL/,Alumina 

